Elon Musk is encouraging people to move to San Francisco and work there because he says the "city can't survive" unless it overcomes the urban doom loop. The billionaire owner of Twitter tweeted on Monday that it was "important for more people to come to work in San Francisco or the rest of the city can't survive." Musk recently had the Twitter sign removed from Twitter's headquarters in San Fransisco. The company recently changed its logo to X, and a giant sign was put on top of the building that has irritated some neighbors.